After going through the first yellow door, it is possible to climb onto the ledge and walk north along the east side of the wall. At the end of the ledge it is possible to jump onto a nearby platform with a green armor. (sector 93)

After going through the teleporter between the first two yellow doors, turn round and press the misaligned section of wall ahead of you. It lowers, allowing access to a teleporter which leads, via several stepping stones, to a room with a soul sphere. (sector 117)